Cellphone Jammers, Mobile Phone Signal Booster, Prison Jammer manufacturer / supplier in China, offering High Power Signal Jammer Blocker 18 Band WiFi Bluetooth 4G LTE Lojack GPS Handheld WiFi Signal Jammer, High Quality 4 Channels 315/433/868/915MHz Signal Jammer for Vehicle Security Vodasafe-RC40, Portable Signal Jammer with 4 Antennas Jamming for 315/433/868/915MHz with up to 200m Jamming Distance and so on.